Answer
4399.8 psi.
Work Step by Step
$ŷ =0.676x+2676$ (Problem 15 in Section 14.1)
For a 7-day strength of 2550 psi, that is, $x=2550$:
$ŷ =0.676\times2550+2676=68.07$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 14 - Section 14.2 - Assess Your Understanding - Applying the Concepts - Page 698: 11a
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